netlink.c 3.4 KB

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  1. /*
  2. * net/tipc/netlink.c: TIPC configuration handling
  3. *
  4. * Copyright (c) 2005-2006, Ericsson AB
  5. * Copyright (c) 2005, Wind River Systems
  6. * All rights reserved.
  7. *
  8. * Redistribution and use in source and binary forms, with or without
  9. * modification, are permitted provided that the following conditions are met:
  10. *
  11. * 1. Redistributions of source code must retain the above copyright
  12. * notice, this list of conditions and the following disclaimer.
  13. * 2. Redistributions in binary form must reproduce the above copyright
  14. * notice, this list of conditions and the following disclaimer in the
  15. * documentation and/or other materials provided with the distribution.
  16. * 3. Neither the names of the copyright holders nor the names of its
  17. * contributors may be used to endorse or promote products derived from
  18. * this software without specific prior written permission.
  19. *
  20. * Alternatively, this software may be distributed under the terms of the
  21. * GNU General Public License ("GPL") version 2 as published by the Free
  22. * Software Foundation.
  23. *
  24. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25. * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27. * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28. * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29. * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30. * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31. * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32. * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34. * POSSIBILITY OF SUCH DAMAGE.
  35. */
  36. #include "core.h"
  37. #include "config.h"
  38. #include <net/genetlink.h>
  39. static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
  40. {
  41. struct sk_buff *rep_buf;
  42. struct nlmsghdr *rep_nlh;
  43. struct nlmsghdr *req_nlh = info->nlhdr;
  44. struct tipc_genlmsghdr *req_userhdr = info->userhdr;
  45. int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN);
  46. if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
  47. rep_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
  48. else
  49. rep_buf = tipc_cfg_do_cmd(req_userhdr->dest,
  50. req_userhdr->cmd,
  51. NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
  52. NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
  53. hdr_space);
  54. if (rep_buf) {
  55. skb_push(rep_buf, hdr_space);
  56. rep_nlh = (struct nlmsghdr *)rep_buf->data;
  57. memcpy(rep_nlh, req_nlh, hdr_space);
  58. rep_nlh->nlmsg_len = rep_buf->len;
  59. genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid);
  60. }
  61. return 0;
  62. }
  63. static struct genl_family family = {
  64. .id = GENL_ID_GENERATE,
  65. .name = TIPC_GENL_NAME,
  66. .version = TIPC_GENL_VERSION,
  67. .hdrsize = TIPC_GENL_HDRLEN,
  68. .maxattr = 0,
  69. };
  70. static struct genl_ops ops = {
  71. .cmd = TIPC_GENL_CMD,
  72. .doit = handle_cmd,
  73. };
  74. static int family_registered = 0;
  75. int tipc_netlink_start(void)
  76. {
  77. if (genl_register_family(&family))
  78. goto err;
  79. family_registered = 1;
  80. if (genl_register_ops(&family, &ops))
  81. goto err_unregister;
  82. return 0;
  83. err_unregister:
  84. genl_unregister_family(&family);
  85. family_registered = 0;
  86. err:
  87. err("Failed to register netlink interface\n");
  88. return -EFAULT;
  89. }
  90. void tipc_netlink_stop(void)
  91. {
  92. if (family_registered) {
  93. genl_unregister_family(&family);
  94. family_registered = 0;
  95. }
  96. }